Controlling coal-dust furnaces



Dec. 13, 1932. H 1,890,542

CONTROLLING COAL DUST FURNACES Filed Aug. 5, 1929 4 Sheets-Sheet 1 Dec. 13, 1932. G. HAYN CONTROLLING COAL DUST "FURNACES Filed Aug. 5, 1929 4 Sheets-Sheet 2 I Dec. 13, 1932. G. HAYN CONTROLLIIYG COAL DUST FURNACES Filed Aug. 5. 1929 4 Sheets-Sheet 3 Georg flay Dec. 13, 1932.

G. HAYN CONTROLLING COAL DUST FURNACES Filed Aug. 5. 1929 4 Sheets-Sheet 4 Patented Dec. 13, 1932 UNITED STATES PATE F E enone HAYN, or ESSEN, GERMANY, ASSIGNOR r RIcrrAnn noosniv, or i mssnn.

PBUSSIA,

GERMANY CONTROLLING COAL-DUST FUBNACES Application filed August 5, 1929, Serial No The invention has for its object an improved device intended to control coal-dust furnaces more particularly those of locomotives.

It is a well known fact that in coal dust furnaces having rigidly coupled drives for supplying the air of combustion and for feeding the coal dust, for instance where the same engine'is used for driving the coal dust feeding device and the blower, when the quantity of coal dust supplied is reduced by reducing the rate of revolutions of the main driving shaft the velocity of the air is also decreased.

When the velocity of the air arrives, below a determined limit, the coal dust finally is no longer held in suspension and drops from the air. Furthermore, as soon as the air velocity becomes lower than that of back ignition of the flame, the latter strikes back into the supply conduit. One has turned therefore frequently to drive the two conveying devices from separate driving shafts which are independent from one another, by either providing two entirely separate driving engines or by providing a common driving engine but a suitable mutual independence by interposing between this engine and the two conveying devices gearings and cou-. plings. It is however of advantage to temporarily eliminate this independence of the two drives when the furnace should start or come to rest, in so far as in starting, the air supply has to be turned on previous to the coal dust supply and, inversely, in stopping the fire the coal dust supply has to be shut off previous to the air supply, in order to avoid choking of the mixture conduits and exits of the burner nozzles and to prevent thereby the above-mentioned danger of back ignition.

Now the object of my present invention is a particularly well suited arrangement for mutually locking the coal dust and air supply.

In order that my invention can be more readily understood, embodiments of the in vention are illustrated by way of example in the accompanying drawings in which Fig. 1 is a perspective view of the locking arrangement, some parts illustrated in 2, 3, 4 being submitted for the sake of clearness,

. 383,528, and in Germany-August 14, 1928. 7

Fig.2 is a view of a similar locking arrangement, slightly modified relatively to that of Fig. 1,'being a section along line II II of Fig. 4,

Fig. 3 is a view corresponding to Fig. 2 along line III-III of Fig. 4, a

Fig. 4 is a sectional view along line IVIV of Fig. 2. j i Y I In front of the coal dust container 27 (Fig. 4'), which rests upon the locomotivetender (not shown in the drawings) ,in the direction of the eng ne drivers stand, is'provided a skirt 28, which forms a compartment 29 for tools and like articles. A steam turbine 10, driving a blower 11 for supplying combustion air,-is situated beyond the container 27 at the rear end of the tender. The introduction of steam to turbine 10 is controlled by a live steam valve 9, which is actuated by means of valve stem 1. An angular lever 2 is connected with stem 1, for instance in the following manner:

Stem 1 has mounted on it rotatably but axially'non-shiftably a sleeve 13, see Figure 1, which upon stem 1 being turned, that is upon valve 9 being opened and closed, moves to and fro with steml. The sleeve 13 engages slots 14 of the bifurcated upper arm of lever 2. In the embodiment illustrated in Figure 1 the lever 2 by means of a rod 3 is in hinged connection with alocking lever 4, while in the modification shown in Figures2-4 it is connected toan intermediate bell-crank lever 16 that in turn actuates a rod 17 As many locking levers 4 are actuated by rod 17 as coal dust'supplying devices exist.

Inthe path of each of the locking levers 4 or 4' is arranged a stop piece 5 which is designed as a nut shiftable on the threaded portion 12 of a rod 6 and secured against rotation by a bolt 7 engaging a recess 8 of stop piece 5, see best Figure 1. Through the intermediary of a lever 18, rod 6 in known manner controls on the one hand a clutch 19 appertaining to the drive 20, 21 of the coal dust conveying screw 22 which driveris independent of the blower drive, and on the other hand through bevel wheels 23 and a worm drive 24 a damper 25 lodged in the outletsocket26 for thecoaldust. v

The described locking device is mounted on the frame of the coal dust tank and of the supplying devices on the tender or locomotive, the individual levers and rods having their bearing points on these frames, viz. lever 2 is fulcrumed at a, locking lever 4 or 4 at b and b, respectively, lever 16 at 0, rod 17 is mounted in bearings cl, while rod 6 rests inbearings c and f. Bolt 7 is fa stened' at Figure 1'.

When the steam valve leading to the turbine 10 that drives the blower 11 is closed, the

ingthis path when the latter is stop piece 5 is locked by lever 4 or 4, as illus- I trated inFigures 1 to 4. plying device is then unable to be started, as in turning rods 6 in the direction of arrow 0,

Figure 2, to couple the worm drive 20, 21

' and to open the coal dust dampers 25, the stop pieces 5 are shifted in the direction of arrow B,Figure 4, which is then impossible. Only when the steam valve 9 has been opened, that is when lever 2.has been swung by moving the valve stem 1 in the direction of arrow A, Figure 4, and the lever 4 or 4' has been swung to the position shown in dash and dotted lines in Figure lwhereby the stop pieces 5 become free tomove, the coal dust supply is able to be started.

Inversely, when the furnace should be stopped, the steam valve 9 can be closed only after the stop pieces 5 which now project into the path of the locking levers 4 or 4 and locks them against motion have returned to initial position.

What I claim and desire to secureby Letters Patent is 7.

1. In a coal dust furnace for locomotives a device for starting and stopping the sup? ply of combustion air and a device for starting and stopping the supply of coal'dust, a member adapted to take. part in the operating motions of said, first-named device, another memberadapted to take part in the operating motions of said last-named device, said first-named member projecting into the path of said last-namedmember when said first-named device is in stop position but leaving said path when the latter is moved to starting position. a Y 2'. In a coal dustfurnace for locomotives a device for startingand stopping the supply of combustion air and a device for starting and stopping the supply of coal dust, a member adapted to take part in the operating motions of said first-named device, another member adapted to take part in the operating motions of said last-named device, said first-named member projecting into the path of said last-named member when said first-named device is in stop position but leavingsaid path when the latter ismoved to starting position, and said lastnamed member "projecting intothe path of said first-named member when said lastnamed device is in starting position but leav- The coal-dust sup- I moved to stop specification signed at this 24th day of July,

GEORG HAYN. 

